Police searched a home in San Francisco on Tuesday in connection with the high-profile disappearance of 10-year-old Kevin Collins nearly 30 years ago.

The San Francisco Police Department said in a statement that the examination of the backyard and garage of the house near the city's Haight-Ashbury district was a "follow up to the cold case investigation" into Collins' disappearance. SFPD said the current residents aren't suspects.

A law enforcement official said a "person of interest" in Collins' disappearance lived in the house at the time. That person has since died.

The official spoke on condition of anonymity because the search warrant used to inspect the property was sealed.

During the search, cadaver dogs indicated the presence of remains under the concrete in the garage. The Police Department said a preliminary review of the remains showed them to be animal bones, but the San Francisco medical examiner's office was conducting further tests.

SFPD didn't disclose what prompted investigators to seek a search warrant and renew the probe into the case. The FBI and the Alameda County Sheriff's Department contributed to the search Tuesday.

Collins was last seen waiting for a bus in the neighborhood after basketball practice at St. Agnes School in the Haight.

Following his disappearance, a local search that included the plastering of his photograph on posters throughout the city blossomed into one of the first child disappearances to garner national attention. His photograph was on the cover of Newsweek in 1984.